#include<iostream>
#include<map>
using namespace std;
struct Book{
	string isbn;
	unsigned int unit_sold;
	double selling_price;
	double sale_price;
};
void add_book(const string& isbn,map<string,Book>& info){
	
}
void read_data(const string&fileName, map<string,Book>& info){
	
}
void search_book_by_isbn(const string& isbn, map<string,Book>& info){
	
}
int main(){
	map<string,Book>info;
	
	}
